Symmetricom 5071A, Assembly And Service Manual

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3. Theory of Operation
Functional Block Descriptions
130
Functional Block Descriptions
This section provides you with information about how assemblies and
modules work together in groups to provide the functions and signals
described in the simplified functional description.
Figure 3-2 is an overall block diagram of the 5071A that shows all assemblies
and modules within the six functional blocks. The blocks and their
assembly/module components and connections are discussed and tabulated
in approximate order of signal flow within each block.
Instrument Control Block:
•
A3 Microprocessor
•
A7 Interface
•
A13 Front Panel
•
Instrument bus (I-bus)
Reference Oscillator/RF chain Block:
•
A19 Reference Oscillator (VCXO)
•
A9 Frequency Multiplier
•
A5 87 MHz PLL
•
A4 Digital Synthesizer
•
A18 9.2 GHz PLL
•
A15 9.2 GHz Microwave Generator Module
Cesium Beam Tube Block:
•
A2 CBT Controller
•
A16 High Voltage Supply Module
•
A17 CBT (Cesium Beam Tube)
Analog Signal Chain Block:
•
A14 Signal Amplifier Module
•
A6 Servo
Input/Output Block:
•
A10 Output Frequency Distribution Amplifier Module
•
A8 1 PPS
Power Supply Block:
•
LF1 Line Filter/Cable Assembly
•
T1 Toroidal Power Transformer
•
A1 Rectifier/Crowbar/Ext Dc Input Filter circuits
•
A11 Power Steering Logic
•
A12 Dc-Dc Power Converter Module
•
B1 24-V Internal Standby Batteries (Does not apply for Opt. 048).